SCL · Stepan Co

Each RSU represents a contingent right to receive one share of Stepan Company common stock.

Vest ratably over three years beginning on the date shown.

Withholding of shares to satisfy tax liability on the vesting of RSUs.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Each restricted stock unit ("RSU") represents a contingent right to receive one share of Stepan Company common stock.

Vest ratably over three years beginning on the date shown.

Withholding of shares to satisfy tax liability on the vesting of RSUs.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Withholding of shares to satisfy tax liability on the vesting of RSUs.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Each RSU represents a contingent right to receive one share of Stepan Company common stock.

Vests ratably over three years beginning on the date shown.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Each RSU represents a contingent right to receive one share of Stepan Company common stock.

Vest ratably over three years beginning on the date shown.

Withholding of shares to satisfy tax liability on the vesting of RSUs.

Vests ratably over three years beginning on the date shown.

Each restricted stock unit ("RSU") represents a contingent right to receive one share of Stepan Company common stock.

Vests ratably over three years beginning on the date shown.

Each performance share represents a contingent right to receive one share of Stepan Company common stock.

The performance shares vest upon the certification of Stepan Company achieving certain performance goals for the performance period ending December 31, 2028.

Vests ratably over three years beginning on the date shown.

Each performance share represents a contingent right to receive one share of Stepan Company common stock.

The performance shares vest upon the certification of Stepan Company achieving certain performance goals for the performance period ending December 31, 2028.

Each restricted stock unit ("RSU") represents a contingent right to receive one share of Stepan Company common stock.

Vests ratably over three years beginning on the date shown.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Each RSU represents a contingent right to receive one share of Stepan Company common stock.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Vests ratably over three years beginning on the date shown.

Withholding of shares to satisfy tax liability on the vesting of RSUs.

Withholding of shares to satisfy tax liability on the vesting of RSUs.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Withholding of shares to satisfy tax liability on the vesting of RSUs.

Each restricted stock unit ("RSU") represents a contingent right to receive one share of Stepan Company common stock.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Vests ratably over three years beginning on the date shown.

Each RSU represents a contingent right to receive one share of Stepan Company common stock.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Vest ratably over three years beginning on the date shown.

Each RSU represents a contingent right to receive one share of Stepan Company common stock.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Vest ratably over three years beginning on the date shown.

Each RSU represents a contingent right to receive one share of Stepan Company common stock.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Vest ratably over three years beginning on the date shown.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Withholding of shares to satisfy tax liability on the vesting of RSUs.

Withholding of shares to satisfy tax liability on the vesting of RSUs.

Each RSU represents a contingent right to receive one share of Stepan Company common stock.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Vest ratably over three years beginning on the date shown.

The restricted stock units ("RSUs") were settled in shares of common stock per the terms of the award.

Withholding of shares to satisfy tax liability on the vesting of RSUs.

Each performance share represents a contingent right to receive one share of Stepan Company common stock.

The performance shares vest upon the certification of Stepan Company achieving certain performance goals for the performance period ending December 31, 2028.

The performance shares vest upon the certification of Stepan Company achieving certain performance goals for the performance period ending December 31, 2028.

This Form 4/A amends the reporting person's original Form 4 filed on March 4, 2026 (the "Original Filing"). The Original Filing inadvertently reported an incorrect stock appreciation right ("SAR") conversion/exercise price due to an administrative error in the pricing calculation. The correct conversion/exercise price for the reported transaction is $50.06 not $17.47 as previously reported. This amendment corrects the reported conversion/exercise price. No other aspects of the reported transaction are affected.

Vest ratably over three years beginning on the date shown.

This Form 4/A amends the reporting person's original Form 4 filed on March 4, 2026 (the "Original Filing"). The Original Filing inadvertently reported an incorrect stock appreciation right ("SAR") conversion/exercise price due to an administrative error in the pricing calculation. The correct conversion/exercise price for the reported transaction is $50.06 not $17.47 as previously reported. This amendment corrects the reported conversion/exercise price. No other aspects of the reported transaction are affected.

Vest ratably over three years beginning on the date shown.

Each performance share represents a contingent right to receive one share of Stepan Company common stock.

The performance shares vest upon the certification of Stepan Company achieving certain performance goals for the performance period ending December 31, 2028.

Each performance share represents a contingent right to receive one share of Stepan Company common stock.

The performance shares vest upon the certification of Stepan Company achieving certain performance goals for the performance period ending December 31, 2028.

Each restricted stock unit ("RSU") represents a contingent right to receive one share of Stepan Company common stock.

Vest ratably over three years beginning on the date shown.

Each RSU represents a contingent right to receive one share of Stepan Company common stock.

Vests ratably over three years beginning on the date shown.